A210126 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct values, and new values 0..3 introduced in row major order

8, 2609, 7873809, 198219480450, 41562568796591219, 72599208484317720843697, 1056388250136974018200396639877, 128049790734830831106262989769387911331

Offset

1,1

Comments

Diagonal of A210134

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..1....0..1..0..0..1
..0..0..0..0..0....1..2..3..2..3....2..1..3..1..2....1..2..1..2..2
..0..0..0..0..0....0..2..1..0..1....1..3..2..2..0....3..0..3..3..0
..0..0..0..0..0....2..1..3..2..1....2..2..1..3..0....0..1..3..3..2
..1..2..1..3..2....3..0..3..1..0....1..3..2..2..1....1..2..1..0..1

Crossrefs

Sequence in context: A325062 A247733 A343696 * A259440 A172957 A233169

Adjacent sequences: A210123 A210124 A210125 * A210127 A210128 A210129

Keyword

nonn

Author

R. H. Hardin Mar 17 2012

Status

approved